Covers the work of the units supporting the Australian infantry battalions in Vietnam. Shows 105mm Howitzers of the artillery; Centurion tanks and M113 Armoured personnel carriers; Cessna fixed wing spotter aircraft and Sioux observation helicopters marking targets; signallers using various types of communications equipment in the field; the establishment of an artillery Fire Support Base; Bushranger gunships of 9 Squadron RAAF in action firing rockets and machine guns, the work of intelligence units; destruction of Viet Cong tunnels by the engineers; resupply of units in the field; tanks and APCs supporting 5 RAR the battle of Binh Ba; a cordon and search of a Vietnamese village; winning the hearts and minds through the Civic Aid program; road building; repair of a bridge blown up by the Viet Cong.